结构模式之代理模式 静态代理

package com.djk.design.struct.proxy;

public interface Action 
{
	void buy();
}

package com.djk.design.struct.proxy;

public class Father implements Action
{
	
	private Action action;

	public Father(Action action) {
		super();
		this.action = action;
	}

	public void buy()
	{
		if (null == action)
		{
			System.out.println("儿子不在家，自己去买");
		}else
		{
			System.out.println("儿子在家，委托儿子去买");
			action.buy();
		}
	}
	
}

package com.djk.design.struct.proxy;

public class Son implements Action
{

	@Override
	public void buy() 
	{
		System.out.println("老爸叫我去买烟");
	}

}

package com.djk.design.struct.proxy;

public class Client 
{
	public static void main(String[] args) 
	{
		Action father = new Father(new Son());
		father.buy();
	}
}